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Core and surface structure and magnetic properties of mechano-synthesized LaFeO3 nanoparticles and their Eu3+-doped and Eu3+/Cr3+-co-doped variants.
Al-Mamari, R T; Widatallah, H M; Elzain, M E; Gismelseed, A M; Al-Rawas, A D; Al-Harthi, S H; Myint, M T Z; Al-Saqri, N; Al-Abri, M.
Afiliación
  • Al-Mamari RT; Physics Department, Sultan Qaboos University, Al-Khoudh, P.O. Box 36, Muscat, 123, Oman.
  • Widatallah HM; Physics Department, Sultan Qaboos University, Al-Khoudh, P.O. Box 36, Muscat, 123, Oman. hishammw@squ.edu.om.
  • Elzain ME; Physics Department, Sultan Qaboos University, Al-Khoudh, P.O. Box 36, Muscat, 123, Oman.
  • Gismelseed AM; Physics Department, Sultan Qaboos University, Al-Khoudh, P.O. Box 36, Muscat, 123, Oman.
  • Al-Rawas AD; Physics Department, Sultan Qaboos University, Al-Khoudh, P.O. Box 36, Muscat, 123, Oman.
  • Al-Harthi SH; Physics Department, Sultan Qaboos University, Al-Khoudh, P.O. Box 36, Muscat, 123, Oman.
  • Myint MTZ; Physics Department, Sultan Qaboos University, Al-Khoudh, P.O. Box 36, Muscat, 123, Oman.
  • Al-Saqri N; Physics Department, Sultan Qaboos University, Al-Khoudh, P.O. Box 36, Muscat, 123, Oman.
  • Al-Abri M; Nanotechnology Research Center, Sultan Qaboos University, Al-Khoudh, P.O. Box 17, Muscat, 123, Oman.
Sci Rep ; 14(1): 14770, 2024 Jun 26.
Article en En | MEDLINE | ID: mdl-38926594
ABSTRACT
The core and surface structure, and magnetism of mechano-synthesized LaFeO3 nanoparticles (30-40 nm), Eu3+-doped (La0.70Eu0.30FeO3), and Eu3+/Cr3+ co-doped (La0.70Eu0.30Fe0.95Cr0.05O3) are reported. Doping results in a transition from the O'-type to the O-type distorted structure. Traces of reactants, intermediate phases, and a small amount of Eu2+ ions were detected on the surfaces of the nanoparticles. The nanoparticles consist of antiferromagnetic cores flanked by ferromagnetic shells. The Eu3+ dopant ions enhance the magnetization values relative to those of the pristine nanoparticles and result in magnetic susceptibilities compatible with the presence of Eu3+ van Vleck paramagnetism of spin-orbit coupling constant (λ = 363 cm-1) and a low temperature Curie-Weiss like behavior associated with the minority Eu2+ ions. Anomalous temperature-dependent magnetic hardening due to competing magnetic anisotropy and magnetoelectric coupling effects together with a temperature-dependent dopant-sensitive exchange bias, caused by thermally activated spin reversals at the core of the nanoparticles, were observed.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2024 Tipo del documento: Article País de afiliación: Omán Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2024 Tipo del documento: Article País de afiliación: Omán Pais de publicación: Reino Unido